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A ferric chloride dosage of 40 mg/l and an equivalent dosage of lime are used to coagulate a water.
(a) How many pounds of ferric chloride per million gallons are used?
(b) How many pounds of hydrated lime per million gallons are used, assuming a purity of 70 % CaO?
(c) How many pounds of ferric hydroxide are theoretically produced per million gallons of water treated?
A fan is to be selected to ventilate a bathroom whose dimensions are 2 m x 3 m x 3 m. The air velocity is not to exceed 8 m/s to minimize vibration and noise.
With a safety factor of two on the time, determine the maximum static stress the component must sustain in order to have a service life of 10000 hours.
A 20 kg box is on an upward inclined surface of 30 degrees from the floor. the velocity of the box is zero when it is subjected to a constant horizontal force F=30N. assuming the surface is smooth,
Let E be an unsorted set of n segments that are the edges of a convex polygon. Describe an O(nlogn) algorithm that computes from E a list containing all vertices of the polygon, sorted in clockwise order.
Assume that at one end of the column a clockwise moment of 100 k-ft is present, and that at the other end of the column a counter-clockwise moment of 25 k-ft is present. you may assume that k= 1.
Assume that the sewer flow and the stream flow are completely mixed, that the salt is a conservative substance (it does not react), and that the system is at steady state.
An embankment for a highway 30m wide & 1.5m in a compacted thickness is to be constructed from a sandy trucked from a borrow pit. the water contenet of the sandy soil in the borrow pit is 15%& its void ratio is 0.69.
What force is necessary to lift a thin 25-mm diameter ring out of :
an embarkment will be constructed with the soil compacted to 95 percent of the max dry density. the borrow material, is deposited at a uniform density of 75 percent of the max dry density. the roadway embankment will require 75,000 cubic yards of ..
The specified concrete strength fc for a new building is 6000 psi. Calculate the required average strength fc for the concrete ( a) if there are no prior test results for concrete with a compressive strength within 1000 psi of fc made with sim-ilar m..
A Horizontal curve on a single-lane highway has its PC at station 123+70 and its PI at station 130+90. The curve has a super-elevation of 0.06 ft/ft and is designed for 70 mph. What is the station of the PT
Concrete cover on both sides. Sketch how you will place the bars and calculate the location of the effective depth. Place as many bars in the lower layers as possible.
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